Backyard pool covered for winter with fallen leaves nearby

Top Mistakes People Make During Pool Closing

Closing your pool for the season is more than just putting on a cover. A rushed or incomplete process can create expensive and frustrating problems when it is time to reopen. By learning the most common mistakes, you can take steps to protect your pool year-round.

Not Balancing the Water Chemistry

Failing to test and adjust your water chemistry before closing can cause scaling, staining, and algae growth over the winter. Always ensure:

  • pH between 7.2 and 7.6

  • Alkalinity between 80 and 120 ppm

  • Chlorine or sanitizer at proper winter levels

Chemical balance helps prevent corrosion and mineral deposits.

Skipping a Deep Cleaning

Leaving debris in the pool allows bacteria and algae to thrive under the cover. Before closing:

  1. Skim leaves and debris.

  2. Brush the pool walls and floor.

  3. Vacuum thoroughly.

A clean start prevents murky water at opening.

Not Lowering the Water Level Correctly

Lowering the water too much can damage the liner, while keeping it too high can allow freezing water to damage tiles. Follow your pool manufacturer’s recommendations for the right winter water level.

Forgetting to Drain and Protect Equipment

Water left in pipes, pumps, and filters can freeze and cause cracks. Drain water from:

  • Pool pump and filter

  • Heater

  • Pool cleaner lines

Add pool-safe antifreeze to plumbing lines in colder climates.

Ignoring the Pool Cover Condition

Using a damaged or ill-fitting cover allows debris, sunlight, and contaminants to enter the pool. Choose a durable, properly fitted winter cover and inspect it regularly for tears or sagging.

Overlooking Algaecide Use

Adding a winter algaecide before covering your pool helps prevent blooms when temperatures rise in early spring. Skipping this step can result in green water by reopening time.

Closing Too Late in the Season

Waiting until after algae growth has begun or debris has piled up makes winter maintenance more difficult. Close the pool once temperatures consistently drop below swimming range.

Failing to Check the Pool Mid-Winter

Some owners ignore their pool after closing, but heavy snow, high winds, or storms can damage the cover. Periodic checks ensure your cover stays secure and your water remains protected.

By avoiding these common mistakes, you can extend the life of your pool equipment, keep your water in better shape, and enjoy an easier start to next swimming season.
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